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Sun, 21 Sep 2025 06:34:44 -0700 (PDT) From: Antoni Pokusinski To: jic23@kernel.org, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, linux@roeck-us.net, rodrigo.gobbi.7@gmail.com, naresh.solanki@9elements.com, michal.simek@amd.com, grantpeltier93@gmail.com, farouk.bouabid@cherry.de, marcelo.schmitt1@gmail.com, Antoni Pokusinski Subject: [PATCH 3/3] iio: mpl3115: add support for sampling frequency Date: Sun, 21 Sep 2025 15:33:28 +0200 Message-Id: <20250921133327.123726-4-apokusinski01@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250921133327.123726-1-apokusinski01@gmail.com> References: <20250921133327.123726-1-apokusinski01@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When the device is in ACTIVE mode the temperature and pressure measurements are collected with a frequency determined by the ST[3:0] bits of CTRL_REG2 register. Signed-off-by: Antoni Pokusinski --- drivers/iio/pressure/mpl3115.c | 80 ++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) diff --git a/drivers/iio/pressure/mpl3115.c b/drivers/iio/pressure/mpl3115.c index cf34de8f0d7e..2f1860ca1f32 100644 --- a/drivers/iio/pressure/mpl3115.c +++ b/drivers/iio/pressure/mpl3115.c @@ -28,6 +28,7 @@ #define MPL3115_INT_SOURCE 0x12 #define MPL3115_PT_DATA_CFG 0x13 #define MPL3115_CTRL_REG1 0x26 +#define MPL3115_CTRL_REG2 0x27 #define MPL3115_CTRL_REG3 0x28 #define MPL3115_CTRL_REG4 0x29 #define MPL3115_CTRL_REG5 0x2a @@ -46,6 +47,8 @@ #define MPL3115_CTRL_ACTIVE BIT(0) /* continuous measurement */ #define MPL3115_CTRL_OS_258MS (BIT(5) | BIT(4)) /* 64x oversampling */ +#define MPL3115_CTRL_ST (BIT(3) | BIT(2) | BIT(1) | BIT(0)) + #define MPL3115_CTRL_IPOL1 BIT(5) #define MPL3115_CTRL_IPOL2 BIT(1) @@ -53,6 +56,25 @@ #define MPL3115_CTRL_INT_CFG_DRDY BIT(7) +static const unsigned int mpl3115_samp_freq_table[][2] = { + { 1, 0}, + { 0, 500000}, + { 0, 250000}, + { 0, 125000}, + { 0, 62500}, + { 0, 31250}, + { 0, 15625}, + { 0, 7812}, + { 0, 3906}, + { 0, 1953}, + { 0, 976}, + { 0, 488}, + { 0, 244}, + { 0, 122}, + { 0, 61}, + { 0, 30}, +}; + struct mpl3115_data { struct i2c_client *client; struct iio_trigger *drdy_trig; @@ -163,10 +185,60 @@ static int mpl3115_read_raw(struct iio_dev *indio_dev, default: return -EINVAL; } + case IIO_CHAN_INFO_SAMP_FREQ: + ret = i2c_smbus_read_byte_data(data->client, MPL3115_CTRL_REG2); + if (ret < 0) + return ret; + + ret &= MPL3115_CTRL_ST; + + *val = mpl3115_samp_freq_table[ret][0]; + *val2 = mpl3115_samp_freq_table[ret][1]; + return IIO_VAL_INT_PLUS_MICRO; } return -EINVAL; } +static int mpl3115_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + if (mask != IIO_CHAN_INFO_SAMP_FREQ) + return -EINVAL; + + *type = IIO_VAL_INT_PLUS_MICRO; + *length = ARRAY_SIZE(mpl3115_samp_freq_table) * 2; + *vals = (int *)mpl3115_samp_freq_table; + return IIO_AVAIL_LIST; +} + +static int mpl3115_write_raw(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + int val, int val2, long mask) +{ + struct mpl3115_data *data = iio_priv(indio_dev); + int i, ret; + + if (mask != IIO_CHAN_INFO_SAMP_FREQ) + return -EINVAL; + + for (i = 0; i < ARRAY_SIZE(mpl3115_samp_freq_table); i++) + if (val == mpl3115_samp_freq_table[i][0] && + val2 == mpl3115_samp_freq_table[i][1]) + break; + + if (i == ARRAY_SIZE(mpl3115_samp_freq_table)) + return -EINVAL; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + ret = i2c_smbus_write_byte_data(data->client, MPL3115_CTRL_REG2, i); + iio_device_release_direct(indio_dev); + return ret; +} + static irqreturn_t mpl3115_trigger_handler(int irq, void *p) { struct iio_poll_func *pf = p; @@ -224,6 +296,9 @@ static const struct iio_chan_spec mpl3115_channels[] = { .type = IIO_PRESSURE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), + .info_mask_shared_by_all_available = + BIT(IIO_CHAN_INFO_SAMP_FREQ), .scan_index = 0, .scan_type = { .sign = 'u', @@ -237,6 +312,9 @@ static const struct iio_chan_spec mpl3115_channels[] = { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), + .info_mask_shared_by_all_available = + BIT(IIO_CHAN_INFO_SAMP_FREQ), .scan_index = 1, .scan_type = { .sign = 's', @@ -307,6 +385,8 @@ static const struct iio_trigger_ops mpl3115_trigger_ops = { static const struct iio_info mpl3115_info = { .read_raw = &mpl3115_read_raw, + .read_avail = &mpl3115_read_avail, + .write_raw = &mpl3115_write_raw, }; static int mpl3115_trigger_probe(struct mpl3115_data *data, -- 2.25.1